DFS3449W AN INVALID DIRECTORY BLOCK WAS READ FOR xxxxxxx - nn
Explanation
During a /MODIFY PREPARE or INITIATE OLC PHASE(PREPARE) command for an online change operation that included changing the MFS format library, an invalid directory block was read for a data set that has the DDNAME indicated in the message by xxxxxxx (FORMATA or FORMATB) and a number nn indicating the concatenated data set for that DDNAME.
System action
The command is ignored.
Operator response
The data set indicated in this message has an error in the partitioned data set directory. This data set will need to be restored from a backup, or be recreated.